WO2021131224A1 - 導波管の接続構造、導波管コネクタ、モード変換機、及び、導波管ユニット - Google Patents

導波管の接続構造、導波管コネクタ、モード変換機、及び、導波管ユニット Download PDF

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Publication number
WO2021131224A1
WO2021131224A1 PCT/JP2020/037991 JP2020037991W WO2021131224A1 WO 2021131224 A1 WO2021131224 A1 WO 2021131224A1 JP 2020037991 W JP2020037991 W JP 2020037991W WO 2021131224 A1 WO2021131224 A1 WO 2021131224A1
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WIPO (PCT)
Prior art keywords
waveguide
connection
dimensional component
hole
insertion hole
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PCT/JP2020/037991
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English (en)
French (fr)
Japanese (ja)
Inventor
正 渡邊
末定　新治
Original Assignee
オリンパス株式会社
福井県
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by オリンパス株式会社, 福井県 filed Critical オリンパス株式会社
Priority to CN202080076099.7A priority Critical patent/CN114631227B/zh
Publication of WO2021131224A1 publication Critical patent/WO2021131224A1/ja
Priority to US17/824,034 priority patent/US12046793B2/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/04—Fixed joints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/04—Fixed joints
    • H01P1/042—Hollow waveguide joints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H01P3/122—Dielectric loaded (not air)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H01P3/14—Hollow waveguides flexible
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/16—Dielectric waveguides, i.e. without a longitudinal conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices

Definitions

  • the present invention relates to a waveguide connection structure, a waveguide connector, a mode converter, and a waveguide unit, and more particularly to a waveguide connection structure having a braided outer conductor, a waveguide connector, and a mode.
  • the present invention relates to a converter and a waveguide unit.
  • a transmission method using a metal wire which has been widely used in short-distance information transmission, specifically, a transmission method using a coaxial line, a twisted pair line, a twisted line, etc., can achieve a communication speed of several tens of Gbps or more. It was difficult to deal with.
  • optical communication technology For transmission of large-capacity information such as high-definition video, it is conceivable to use optical communication technology that has been conventionally used for long-distance transmission or high-speed communication in data centers.
  • the transmission / reception unit used for optical communication is very expensive, and there is an economic problem that it is difficult to adopt it as a communication means in short-distance information communication, especially for products in the popular price range.
  • the optical communication transmission / reception unit requires a connection technology with a high accuracy of about several ⁇ m for line connection, and communication may be interrupted only by fine dust or dust adhering to the connection surface. .. Therefore, the optical communication transmission / reception unit has a problem that it is difficult to secure reliability, especially in a product in which repeated connections are made. That is, it has been difficult to use optical communication technology as an alternative to the conventional metal wire transmission method used in short-range communication.
  • a flexible waveguide is used at high speed by millimeter waves. Development of a communication method for communication is underway.
  • Japanese Patent Application Laid-Open No. 2017-147548 describes a hollow first tubular dielectric, a tubular conductor arranged on the outer circumference of the first tubular dielectric, and an outer circumference of the tubular conductor.
  • a flexible waveguide having a second tubular dielectric material arranged in is proposed.
  • a hollow tubular dielectric is arranged, and a dielectric material including a metal plating layer covering two surfaces where electric fields intersect and two surfaces covered with the metal plating layer.
  • a dielectric material including a metal plating layer covering two surfaces where electric fields intersect and two surfaces covered with the metal plating layer.
  • Japanese Patent No. 6343827 proposes a flexible waveguide having a rod-shaped dielectric arranged in the center and an outer conductor in which flat foil threads are braided on the outer surface of the dielectric. Has been done.
  • the present inventor paid particular attention to the flexible waveguide disclosed in Japanese Patent No. 6343827 among the above-mentioned flexible waveguides, and proceeded with diligent research as it is particularly highly practical. There is.
  • the flexible waveguide disclosed in Japanese Patent No. 6343827 is equivalent to the conventional flexible waveguide because the outer conductor has a braided structure. It was found that the desired performance could not be obtained with the connection structure of the above, especially in the radio wave transmission in the frequency band higher than the millimeter wave band.
  • a flexible waveguide having an outer conductor having a braided structure receives radio waves at a connection point (or connection surface) when connected to another member without a special connection structure. Loss (reflection and leakage of radio waves) will occur. This radio wave loss increases as the frequency increases, and becomes a practical problem especially in radio wave transmission in a frequency band higher than the millimeter wave band. Therefore, there is a problem that a flexible waveguide provided with an outer conductor having a braided structure cannot be practically applied to radio wave transmission in a frequency band higher than the millimeter wave band. That is, in order to effectively utilize the flexible waveguide disclosed in Japanese Patent No. 6343827, a special connection structure that suppresses the loss of the radio wave is required.
  • the present invention has been made in view of the above circumstances, and is a waveguide capable of preventing loss of radio waves when connecting a waveguide having an outer conductor having a braided structure to another member. It is an object of the present invention to provide a connection structure, a waveguide connector, a mode converter, and a waveguide unit.
  • the waveguide connection structure of one aspect of the present invention is a connection structure for connecting a waveguide used for transmitting a millimeter wave or a radio wave having a frequency higher than the millimeter wave to another member, and the waveguide is , A rod-shaped waveguide and an outer conductor formed by braiding a plurality of flat foil threads having conductivity around the rod-shaped waveguide, and the three-dimensional component which is the other member , The connection surface having at least a part of the conductive region to which the connection expansion portion of the outer conductor is connected in the connection state with the waveguide, and the connection expansion portion of the waveguide in the connection state with the waveguide.
  • connection expanding portion is electrically connected to the connecting surface and the corner portion. It is configured so that it is electrically conductive with the inner surface of the insertion hole through the connection and the connection at the corner portion is smooth.
  • the waveguide is realized by traveling in a pipeline whose inner wall is conductive, while electromagnetic waves are confined in the conduit by the inner wall.
  • the inner surface of the outer conductor of the waveguide (the waveguide formed by) and the inner surface of the insertion hole (the waveguide formed by) continuously have the center wavelength ⁇ of the carrier wave. Connecting in a manner that matches within a range of 1/50 error is called "smooth connection at the corners". If the waveguide on the waveguide side and the waveguide on the three-dimensional member side are continuous within this range of error, the end point reflection at the boundary between the two is sufficiently suppressed to a level where there is no problem, and the signal loss is small.
  • the inner surface of the outer conductor of the waveguide and the inner surface of the insertion hole may be continuous at the connection boundary without any step or groove exceeding the above error.
  • the waveguide connector of one aspect of the present invention has the above-mentioned waveguide connection structure.
  • the mode converter of one aspect of the present invention has the above-mentioned waveguide connection structure.
  • a rod-shaped dielectric having a flat cross-sectional shape and a plurality of flat foil threads having conductivity in the longitudinal direction are braided around the rod-shaped dielectric.
  • a waveguide having an outer conductor formed in an assembled manner and the waveguide connectors that can be connected to a hollow rectangular waveguide are provided at both ends of the waveguide.
  • FIG. 5 is a cross-sectional view showing an enlarged cross section of a connection portion in a state where a flexible waveguide, a fixing member, and a three-dimensional component are combined. It is sectional drawing which shows the cross section of the state which combined the flexible waveguide of 2nd Embodiment, a fixing member, and a three-dimensional component. It is a side view which shows the structural example A of the shape of the tip of a dielectric.
  • FIG. 1A shows the appearance of a flexible waveguide used for radio wave transmission in a millimeter wave band, a fixing member, and a three-dimensional component, and shows a state in which an end portion of the flexible waveguide is combined with the fixing member.
  • FIG. 1B is an external view showing the appearance of a flexible waveguide, a fixing member, a three-dimensional component, and a pressing auxiliary member
  • FIG. 1C is an external view showing the flexible waveguide and the flexible waveguide. It is an external view which shows the state after assembling which combined the fixing member, a three-dimensional component, and a pressing auxiliary member.
  • FIG. 2A is an external view showing the appearance of an outer conductor formed by assembling flat foil threads in a flexible waveguide in a braided shape
  • FIG. 2B is an external view showing the appearance of an outer conductor formed by assembling flat foil threads in a braided shape.
  • It is sectional drawing which shows the cross section of an outer conductor.
  • FIG. 3 is a cross-sectional view showing a cross section of a flexible waveguide, a fixing member, and a three-dimensional component in combination.
  • FIG. 4 is a cross-sectional view showing an enlarged cross section of a connection portion in a state where the flexible waveguide, the fixing member, and the three-dimensional component are combined.
  • the waveguide connection structure is a flexible waveguide 10 and a fixation arranged at the end of the flexible waveguide 10. It is composed of a member 20, a three-dimensional component 30 to which the end of the flexible waveguide 10 is connected, and a pressing auxiliary member 40 that presses the fixing member 20 and the three-dimensional component 30.
  • the connection structure of the waveguide of the present embodiment will be described using the flexible waveguide 10 having flexibility as an example, but the connection structure is not limited to having flexibility, and the braid is not limited to the flexible waveguide.
  • a waveguide made of another material such as semi-flexible or rigid may be used as long as it has a shaped outer conductor.
  • the flexible waveguide 10 is provided in a rod-shaped flexible dielectric 11 having a major axis a and a minor axis b and having a flat cross-sectional shape, and around the dielectric 11. It is composed of an outer conductor 12.
  • the outer conductor 12 is formed by assembling a plurality of flat foil threads 13 having conductivity in the longitudinal direction around the dielectric 11 in a braided shape. Specifically, the outer conductor 12 is wound around the outer peripheral surface of the dielectric 11, and the flat foil threads 13 are knitted so as to form a braided structure.
  • the strip-shaped flat foil thread 13 has a rectangular cross section with a cross section perpendicular to the longitudinal direction, and has a structure in which a resin film 14 containing a non-metallic substance and a metal foil 15 containing a metallic substance are bonded together.
  • a resin film 14 containing a non-metallic substance and a metal foil 15 containing a metallic substance are bonded together.
  • the flat foil thread 13 is arranged in a braided shape so that the metal foil 15 side (lower side when facing FIG. 2B) is inside the outer conductor 12 constituting the flexible waveguide 10. That is, the metal foil 15 side of the outer conductor 12 is arranged so as to be in contact with the outside of the dielectric 11.
  • the fixing member 20 is a metal part made of brass or the like, and has a through hole 21 into which the flexible waveguide 10 is inserted.
  • the end of the flexible waveguide 10 is inserted together with the outer conductor 12 into the through hole 21 of the fixing member 20.
  • the end portion of the outer conductor 12 forms the connection expansion portion 22 so as to be expanded with respect to the fixing member 20 while maintaining the braided structure.
  • the through hole 21 of the fixing member 20 has a flat cross section having a major axis C and a minor axis D.
  • the three-dimensional component 30 is a metal component formed of brass or the like, and has an insertion hole 31 into which the dielectric 11 can be inserted, a corner portion 32 serving as an insertion end of the insertion hole 31, and a connection surface 33 adjacent to the corner portion 32. And have.
  • the insertion hole 31 of the three-dimensional component 30 has a flat cross section having a major axis A and a minor axis B at a corner portion 32 which is an insertion end.
  • the three-dimensional component 30 is formed of a metal component, the inner surface of the insertion hole 31, the corner portion 32, and the connecting surface 33 have conductivity and are electrically connected to each other.
  • the three-dimensional component 30 is not limited to the metal component, and may be a molded circuit component (MID: Molded Interconnect Device) in which a metal film is formed on the surface of the resin molded product.
  • MID Molded Interconnect Device
  • the pressing auxiliary member 40 is, for example, a binder clip.
  • two binder clips are used to sandwich and press the fixing member 20 and the three-dimensional component 30.
  • the binder clip does not need to have a special structure, and may be a commercially available one, for example.
  • a binder clip is used as an example of the pressing auxiliary member 40, the present invention is not limited to this, and for example, an elastic body such as a screw or rubber or an adhesive is used to realize the same function. May be good.
  • the dielectric 11 at the end of the flexible waveguide 10 is inserted into the insertion hole 31 of the three-dimensional component 30.
  • the connection expansion portion 22 is sandwiched and fixed between the connection surface 33 of the three-dimensional component 30 and the fixing member 20.
  • the major axis a and the minor axis b of the dielectric 11 are substantially the same as the major axis A and the minor axis B of the insertion hole 31 of the three-dimensional component 30, respectively.
  • the position of the end portion of the flexible waveguide 10 is uniquely determined.
  • connection expanding portion 22 formed by the end portion of the outer conductor 12 is sandwiched and fixed between the connecting surface 33 of the three-dimensional component 30 and the fixing member 20. Then, the connection expanding portion 22 is fixed in a state in which the braided structure is expanded from the corner portion 32 of the three-dimensional component 30 along the connecting surface 33 and the braided structure is expanded. At this time, the connection expansion portion 22 is pressed between the fixing member 20 and the three-dimensional component 30 by the pressing auxiliary member 40.
  • the major axis C and the minor axis D of the flat through hole 21 of the fixing member 20 are the major axis and the minor axis b obtained by adding twice the thickness d of the outer conductor 12 to the major axis a and the minor axis b in the cross section of the dielectric 11. Has a diameter.
  • connection structure of the flexible waveguide configured in this way will be described.
  • the entire inner surface of the insertion hole 31 of the three-dimensional component 30 has conductivity, and the entire surface from the corner portion 32 to the connecting surface 33 has conductivity. Therefore, the insertion hole 31 functions as a waveguide and can transmit radio waves.
  • the flexible waveguide 10 transmits radio waves to the inside by the function of the outer conductor 12 having a braid structure. That is, the insertion hole 31 of the three-dimensional component 30 and the flexible waveguide 10 both transmit radio waves, and the connection is made at the corner portion 32.
  • the major axis of the dielectric 11 is a
  • the minor axis is b
  • the major axis of the insertion hole 31 of the three-dimensional component 30 is A
  • the minor axis is B
  • the major axis of the through hole 21 of the fixing member 20 is C
  • the minor axis is D.
  • A, B, C, and D of the present embodiment are set as follows with reference to the rod-shaped flexible dielectric dimensions a and b.
  • the major axis A of the insertion hole 31 of the three-dimensional component 30 is approximately equal to the major axis a of the dielectric 11.
  • the minor axis B of the insertion hole 31 of the three-dimensional component 30 is approximately equal to the minor axis b of the dielectric 11.
  • the major axis C of the through hole 21 of the fixing member 20 is approximately equal to the length (a + 2d) obtained by adding the major axis a of the dielectric 11 plus twice the thickness d of the outer conductor 12.
  • the minor diameter D of the through hole 21 of the fixing member 20 is approximately equal to the length (b + 2d) obtained by adding the minor diameter b of the dielectric 11 plus twice the thickness d of the outer conductor 12.
  • approximately equal means that the dielectric 11 can be inserted into the insertion hole 31 of the three-dimensional component 30 and there is no rattling, and the flexible waveguide 10 can be inserted into the fixing member 20 and there is no rattling. Refers to dimensional setting.
  • the inner surface dimension of the outer conductor 12 of the flexible waveguide is the corner portion 32 which is the end surface of the insertion hole 31 of the three-dimensional component 30.
  • the major axis C and the minor axis D of the through hole 21 of the fixing member 20 are substantially equal to the diameter obtained by adding twice the thickness d (2 ⁇ d) of the outer conductor 12 to the major axis a and the minor axis b of the dielectric 11.
  • the outer conductor 12 keeps its shape until it comes into contact with the corner portion 32 of the three-dimensional component 30, and can be connected without generating a step at the connecting portion.
  • the connection expansion portion 22 makes the connection at the corner portion 32 of the three-dimensional component 30 smooth, and the occurrence of a step in the connection at the corner portion 32 of the three-dimensional component 30 can be minimized. ..
  • this step is a requirement for suppressing the loss (reflection) of radio waves at the waveguide connection portion.
  • this step is a requirement for suppressing the loss (reflection) of radio waves at the waveguide connection portion.
  • this step is 1/50 or less of the wavelength of the radio wave propagating inside the flexible waveguide 10, it is possible to suppress the loss (reflection) of the radio wave at the waveguide connection portion.
  • connection expanding portion 22 is fixed by being pressed by the pressing auxiliary member 40 between the connecting surface 33 of the three-dimensional component 30 and the fixing member 20. At this time, the connection expanding portion 22 extends a braided structure from the corner portion 32 along the connecting surface 33.
  • the flat foil thread 13 having a braided structure has the surface having the metal foil 15 facing the connecting surface 33 side.
  • the metal (metal foil 15) of the outer conductor 12 of the flexible waveguide 10 and the connecting surface 33 of the three-dimensional component 30 having conductivity are between the corner portion 32. In contact with each other, electrical conduction between the two is achieved. This electrical continuity is a requirement for suppressing radio wave loss (radio wave leakage) at the connection portion.
  • the loss of these radio waves tends to be a problem especially in millimeter waves or radio waves in a frequency band higher than millimeter waves. This is because the wavelength of the radio wave in the millimeter wave or the frequency band higher than the millimeter wave is short, and even a slight unevenness of the structure adversely affects the transmission of the radio wave. More specifically, the influence of the structure of the medium on waves, not limited to electromagnetic waves (including not only unevenness but also the inhomogeneity of the medium, etc.) is sufficient if the size of the structure is within about 1/50. It has been found that it can be kept small (see, for example, paragraph numbers [0094] to [0102] of Japanese Patent Application Laid-Open No. 2018-99172).
  • the wavelength of the radio wave of 60 GHz in the free space is 5 mm, and 1/50 of this is 0.1 mm. It is not easy to suppress the step of the outer conductor 12 to 0.1 mm or less.
  • the step of the outer conductor 12 can be easily suppressed to 0.1 mm or less, and a state in which the connection at the corner portion 32 referred to in the present proposal is smooth can be realized.
  • connection expansion portion 22 and the connection surface 33 of the three-dimensional component 30 may be adhered with a conductive adhesive to electrically conduct the connection expansion portion 22 and the connection surface 33 of the three-dimensional component 30.
  • the connection structure of the flexible waveguide 10 does not have to have the fixing member 20 and the pressing auxiliary member 40. That is, for example, if the fixing member 20 and the pressing auxiliary member 40 are used during the bonding work, it is possible to easily suppress the step and perform electrical joining as in the case of using the fixing member 20 and the pressing auxiliary member 40. , It is possible to obtain the same effect.
  • the through hole 21 of the fixing member 20 has a major axis C and a minor diameter C in all the cross sections of the through hole 21, but at least the through hole 21 has the through hole at the side end in contact with the three-dimensional portion 30.
  • connection structure of the flexible waveguide 10 of the present embodiment is designed to prevent loss of radio waves (reflection and leakage of radio waves). Therefore, according to the present embodiment, it is possible to prevent loss of radio waves when connecting a flexible waveguide having an outer conductor having a braided structure to another member.
  • the dimensions of the flat insertion hole 31 of the three-dimensional component 30 are set to match the cross-sectional shape of the flat dielectric 11, so that accurate positioning is possible, so that the assembly can be performed. It's getting easier.
  • the outer conductor 12 assembled in the shape of a braid is expanded to form the connection expansion portion 22, and the members are increased from the conventional waveguide by simply pressing the outer conductor 12 to electrically conduct the three-dimensional component 30. It is possible to achieve electrical conduction without.
  • FIG. 5 is a cross-sectional view showing a cross section of the flexible waveguide of the second embodiment, the fixing member, and the three-dimensional component in combination.
  • the insertion hole 31 of the three-dimensional component 30 of the present embodiment has a tapered structure in which the diameter expands from the surface into which the dielectric 11 is inserted toward the opening 36 on the opposite side.
  • the major axis A and the minor axis B on the connection surface 33 side of the insertion hole 31 are made substantially equal to the major axis a and the minor axis b of the dielectric 11, so that the flexible waveguide 10 and the three-dimensional component 30 can be easily connected. Can be.
  • the tip (end) of the dielectric 11 has a sharp shape, that is, between the opening on the corner 32 side of the insertion hole 31 and the opening 36 on the opposite side of the corner 32 inside the insertion hole 31.
  • the shape of the tip (end) of the dielectric 11 is not limited to the shape shown in FIG.
  • the shapes shown in FIGS. 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B, 10A, and 10B can be adopted. All of these shapes can significantly reduce the loss of radio waves as compared with the shapes shown in FIGS. 11A and 11B.
  • FIG. 6A is a side view showing a configuration example A of the shape of the tip of the dielectric
  • FIG. 6B is a perspective view showing a configuration example A of the shape of the tip of the dielectric
  • FIG. 7A is a side view showing a configuration example B of the shape of the tip of the dielectric
  • FIG. 7B is a perspective view showing a configuration example B of the shape of the tip of the dielectric
  • FIG. 8A is a side view showing a configuration example C of the shape of the tip of the dielectric
  • FIG. 8B is a perspective view showing a configuration example C of the shape of the tip of the dielectric
  • FIG. 9A is a side view showing a configuration example D of the shape of the tip of the dielectric
  • FIG. 9A is a side view showing a configuration example D of the shape of the tip of the dielectric
  • FIG. 9B is a perspective view showing a configuration example D of the shape of the tip of the dielectric.
  • FIG. 10A is a side view showing a configuration example E of the shape of the tip of the dielectric
  • FIG. 10B is a perspective view showing a configuration example E of the shape of the tip of the dielectric.
  • FIG. 11A is a side view showing a comparative example of the shape of the tip of the dielectric
  • FIG. 11B is a perspective view showing a comparative example of the shape of the tip of the dielectric.
  • FIG. 12 is a diagram showing measurement results obtained by experimentally confirming the shape of the tip of the dielectric and the amount of reflection generated.
  • the measurement result (magnitude of reflection) of FIG. 12 shows the vector network after processing the end portion of the rod material of the stretched foamed PTFE as the dielectric 11 into the shapes shown in the constituent examples A to E and the comparative example.
  • the magnitude of reflection at the end of the dielectric 11 was calculated from the measurement results (49.8 to 75.8 GHz band) in the time domain using an analyzer. The smaller the value (the larger the absolute value), the more the reflection. Indicates that is small.
  • the opening 36 on the side opposite to the corner portion 32 can have an opening shape that can be connected to a hollow waveguide.
  • a waveguide connector that can be connected to an appropriate hollow waveguide can be obtained.
  • the flexible waveguide 10 is capable of transmitting radio waves in the 60 GHz band
  • the inner diameter of the opening 36 on the side opposite to the corner 32 is a rectangle with a major axis of 3.759 mm and a minor axis of 1.88 mm.
  • the flexible waveguide 10 of the present invention can be used as a waveguide connector that can be connected to a hollow waveguide for 49.8 to 75.8 GHz.
  • the inner diameter of the opening 36 on the side opposite to the corner 32 is a rectangle having a major axis of 2.54 mm and a minor axis of 1.27 mm.
  • the flexible waveguide 10 of the present embodiment can be used as a waveguide connector that can be connected to a hollow waveguide for 73.8 to 112 GHz.
  • the shape of the connection flange 37 is generally standardized as UG-385 / U, it can be used as a waveguide connector that can be connected to a standardized and generally sold hollow rectangular waveguide. it can.
  • the dielectric 11 inside the waveguide connector does not need to be bent, it may be hard.
  • the dielectric 11 of the flexible waveguide 10 is stretched from the through hole 21 of the fixing member 20 and cut into the shape shown in any of the configuration examples A to E. It will be.
  • the dielectric 11 is soft, it is difficult to form it into the shape shown in any of the configuration examples A to E.
  • the dielectric 11 does not need to be bent inside the waveguide connector, there is an advantage that the harder the dielectric 11, the easier it is to mold. Therefore, depending on the requirements for the waveguide connector, it can be assumed that the dielectric 11 inside the waveguide connector is preferably hard.
  • the flexible waveguide, the fixing member, and the three-dimensional component may be configured as shown in FIG.
  • FIG. 13 is a cross-sectional view showing a cross section of a flexible waveguide, a fixing member, and a three-dimensional component according to a modified example of the second embodiment.
  • the insertion hole 31 of the three-dimensional component 30 has a hole shape having a major axis and a minor axis larger than the major axis a and the minor axis b in the cross section of the dielectric 11, and the connecting surface 33 projects forward.
  • the edge portion 34 is provided.
  • the through hole 21 of the fixing member 20 has a portion having the longest diameter C and the minor diameter D at a position away from the side end in contact with the three-dimensional component 30, and the outer conductor 12 is smoothly connected to the edge portion 34.
  • a presser foot 27 is provided. Further, the outer conductor 12 of the flexible waveguide 10 inserted into the through hole 21 is smoothly expanded in diameter while maintaining its braided structure to form a tapered shape, and is formed on the edge portion 34 of the three-dimensional component 30. Be connected.
  • the end portion of the outer conductor 12 is smoothly bent and connected so as to curve along the edge portion 34 of the three-dimensional component 30.
  • the connection portion 50 between the end portion of the outer conductor 12 and the three-dimensional component 30 has a structure in which a dent is unlikely to occur, and the loss (reflection) of radio waves is suppressed.
  • the tip (end) of the dielectric 11 has a sharp shape similar to the shape shown in FIG. However, here, inside the insertion hole 31 and the through hole 21, between the portion of the through hole 21 having the smallest diameter and the opening 36 on the side opposite to the corner portion 32 of the insertion hole 31. , It has a shape that gradually reduces its cross-sectional area. Again, as shown in the embodiment of FIG. 5, by sharpening the tip of the dielectric 11, the loss (reflection) of the radio wave at the end of the dielectric 11 can be suppressed, and the loss of the radio wave due to the connection can be further reduced. it can.
  • a waveguide connector for connecting the flexible waveguide 10 to another device such as a measuring instrument will be described.
  • FIG. 14A is an external view showing the appearance of the flexible waveguide, the fixing member, the three-dimensional component, and the pressing auxiliary member, and showing the state in which the end portion of the flexible waveguide is combined with the fixing member.
  • FIG. 7B is an external view showing a state before the fixing member is combined with the three-dimensional component.
  • the waveguide connector 60 of the present embodiment is composed of a flexible waveguide 10, a fixing member 20, a three-dimensional component 30, and a pressing auxiliary member 40. ..
  • the connecting surface 33 of the three-dimensional component 30 has a tapered structure that protrudes toward the fixing member 20 when connected to the fixing member 20. Further, a connecting surface 23 having a tapered structure is formed on the tip surface of the fixing member 20 so as to be in contact with the connecting surface 33 of the three-dimensional component 30.
  • the three-dimensional component 30 is provided with a pressing auxiliary member 40 composed of two male screws.
  • a pressing auxiliary member 40 composed of two male screws.
  • a female screw 24 is provided.
  • the fixing member 20 and the three-dimensional component 30 are pressed by screwing the male screw, which is the pressing auxiliary member 40 provided on the three-dimensional component 30, into the female screw 24 provided on the fixing member 20.
  • connection surface 33 having a tapered structure allows the connection expansion portion 22, which is the end of the outer conductor 12, to spread more smoothly than in the first embodiment. As a result, a step at the connection portion between the fixing member 20 and the three-dimensional component 30 is less likely to occur than in the first embodiment.
  • the waveguide connector of the present embodiment has the same effect as that of the first embodiment, and the connection expanding portion 22 spreads more smoothly than that of the first embodiment. Therefore, the fixing member 20 and the three-dimensional component Since the step at the connection portion with the 30 is less likely to occur, the occurrence of radio wave loss can be suppressed as compared with the first embodiment.
  • FIG. 15A is an external view showing the appearance of the flexible waveguide, the fixing member, and the three-dimensional component, and showing the state in which the end portion of the flexible waveguide, the fixing member, and the three-dimensional component are combined.
  • 15B and 15C are external views showing the appearance of a flexible waveguide, a fixing member, a three-dimensional component, and a pressing auxiliary member.
  • the waveguide connector 70 of the present embodiment includes a flexible waveguide 10, a fixing member 20, a three-dimensional component 30, and a pressing auxiliary member 40.
  • the fixing member 20 of the present embodiment is composed of a plurality of fixing members 20A and 20B divided into two in the present embodiment.
  • the fixing member 20 is composed of two fixing members 20A and 20B, but may be composed of three or more fixing members.
  • the pressing assisting member 40 is composed of a plurality of pressing assisting members 40A and 40B divided into two in the present embodiment.
  • the major axis C and the minor axis D of the through hole 21 are substantially equal to the length obtained by adding twice the thickness d of the outer conductor 12 to the major axis a and the minor axis b of the dielectric 11 respectively. Therefore, it may take time and effort to insert the flexible waveguide 10 into the through hole 21 of the fixing member 20 at the time of assembly.
  • one fixing member 20 can be formed by sandwiching the flexible waveguide 10 between the two fixing members 20A and 20B at the time of assembling, so that the assembling property is greatly improved. To do.
  • the pressing auxiliary members 40A and 40B are fixed by the screw member 41 so as to wrap the three-dimensional component 30 and the fixing member 20, and are fixed between the fixing member 20 and the connecting surface 33 of the three-dimensional component 30 by the elasticity thereof. Is designed to give a force to pinch the connection expanding portion 22.
  • the waveguide connector of the present embodiment can adopt a small size and a free shape.
  • the waveguide connector of the present embodiment it is possible to have the same effect as that of the first embodiment, improve the assembling property, and realize the ease of miniaturization.
  • the waveguide connector 70 of the present embodiment is paired with the waveguide connector 71 of FIG. 15C and is used in combination.
  • the waveguide connector 71 has substantially the same structure as the waveguide connector 70, but the waveguide connector 70 has a protruding portion 701 in which the three-dimensional component 30A is projected, whereas the waveguide connector 71 has a protruding portion 701.
  • the three-dimensional component 30B has an insertion portion 711 that is lowered inward. That is, by inserting the protruding portion 701 of the waveguide connector 70 into the insertion portion 711 of the waveguide connector 71, the three-dimensional component 30A of the waveguide connector 70 and the three-dimensional component 30B of the waveguide connector 71 are inserted. Can be connected to each other without misalignment.
  • the insertion holes 31 of the three-dimensional components 30A and 30B in the waveguide connector 70 and the waveguide connector 71 are through holes processed into substantially the same cross-sectional shape as the outer shape of the dielectric 11, and the waveguide connector 70 and The waveguide connector 71 is designed so that the hole positions of the insertion holes 31 match by inserting the protruding portion 701 and the insertion portion 711 together, and the dielectric 11 is inserted in the insertion holes 31. It is inserted inside the insertion hole 31 without a gap.
  • the insertion holes 31 of the three-dimensional component 30A and the three-dimensional component 30B each function as a waveguide, and since they are in contact with each other without any misalignment or gap, radio wave loss does not occur here either. That is, the waveguide connectors 70 and 71 of the present embodiment effectively function as a waveguide connector because they connect the flexible waveguide and the flexible waveguide.
  • connection structure for connecting the flexible waveguide 10 to the mode converter will be described.
  • FIG. 16 is an external view showing the appearance of the flexible waveguide, the fixing member, the three-dimensional component, and the pressing auxiliary member.
  • the mode converter 80 of this embodiment is composed of a flexible waveguide 10, a fixing member 20, a three-dimensional component 30, and a pressing auxiliary member 40.
  • the fixing member 20 of the present embodiment is composed of a plurality of fixing members 20C and 20D divided into two in the present embodiment.
  • the fixing member 20 is composed of two fixing members 20C and 20D, but may be composed of three or more fixing members.
  • the fixing members 20C and 20D are provided with through holes 25 and 26, and the male screw constituting the pressing auxiliary member 40 penetrates the through holes 25 and 26 and is screwed into and fixed to the female screw 35 of the three-dimensional component 30. As a result, the two fixing members 20C and 20D are combined to form the fixing member 20.
  • the male screw constituting the pressing auxiliary member 40 is screwed into the female screw 35, so that the connection expansion portion 22 is sandwiched and fixed between the fixing member 20 and the connecting surface 33 of the three-dimensional component 30.
  • the mode converter of the present embodiment it is possible to have the same effect as that of the first embodiment, improve the assembling property, and realize the ease of miniaturization.
  • FIG. 17 is an external view showing the appearance of a waveguide unit composed of a flexible waveguide, a fixing member, a three-dimensional component, and a pressing auxiliary member.
  • the waveguide unit 90 of the present embodiment is a guide composed of a flexible waveguide 10, a fixing member 20, a three-dimensional component 30, and a pressing auxiliary member 40 arranged at both ends thereof. It consists of a waveguide connector.
  • Each of the waveguide connectors of the present embodiment has the connection structure of the second embodiment, and the insertion hole 31 of the three-dimensional component 30 has a diameter from the surface into which the dielectric 11 is inserted toward the opening on the opposite side. It has a wide taper structure.
  • the tip (end) of the dielectric 11 has a sharp shape, that is, inside the insertion hole 31, between the opening on the corner 32 side of the insertion hole and the opening 36 on the opposite side of the corner 32. , It has a shape that gradually reduces its cross-sectional area.
  • the flexible waveguide 10 has a characteristic of being able to transmit radio waves in the 60 GHz band
  • the three-dimensional component 30 has a rectangular opening 36 having a major axis of 3.759 mm and a minor axis of 1.88 mm, and generally UG-385. It has a connecting flange 37 having a shape standardized as / U.
  • the waveguide unit 90 of the present embodiment can be used in the same manner as a hollow rectangular waveguide that has been standardized and is generally sold.
  • FIGS. 18A, 18B and 18C Examples of transmission characteristic measurement values of the waveguide unit 90 of the present embodiment are shown in FIGS. 18A, 18B and 18C.
  • FIG. 18A is a diagram showing an example of the transmission characteristic measurement value of the waveguide unit when the shape of the configuration example A is adopted at the tip of the dielectric
  • FIG. 18B is a diagram showing an example of the shape of the configuration example E at the tip of the dielectric.
  • FIG. 18C is a diagram showing an example of the transmission characteristic measurement value of the waveguide unit when the above is adopted
  • FIG. 18C shows the transmission characteristic measurement value of the waveguide unit when the shape of the comparative example is adopted at the tip of the dielectric. It is a figure which shows an example.
  • the reflection characteristic (S11) is about ⁇ 20 dB and the transmission characteristic (S21) is the connector.
  • the waviness caused by partial reflection is also sufficiently small, making it a practical waveguide.
  • the reflection characteristic (S11) is smaller than ⁇ 20 dB and the transmission characteristic (transmission characteristic).
  • the waviness caused by the reflection of the connector portion in S21) is even smaller, which makes the waveguide more practical.
  • radio wave loss occurs in the flexible waveguide 10 having the dielectric 11 having a flat cross section and the braided outer conductor 12 formed around the dielectric 11. It is possible to obtain a realistic structure for connecting to other members while achieving both small leakage of radio waves and ease of connection.
  • other members are a conventional waveguide, a tapered waveguide that converts the thickness of the waveguide, a waveguide connector, a mode converter, and the like.
  • a waveguide having an outer conductor having a braided structure is connected to another member. At that time, it is possible to prevent the loss of radio waves.
  • the present invention is not limited to the above-described embodiment, and various modifications, modifications, and the like can be made without changing the gist of the present invention.

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  • Waveguide Connection Structure (AREA)
  • Waveguides (AREA)
PCT/JP2020/037991 2019-12-24 2020-10-07 導波管の接続構造、導波管コネクタ、モード変換機、及び、導波管ユニット WO2021131224A1 (ja)

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US17/824,034 US12046793B2 (en) 2019-12-24 2022-05-25 Connection structure of waveguide, waveguide connector, mode converter, and waveguide unit

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US20220285815A1 (en) 2022-09-08
CN114631227A (zh) 2022-06-14

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